Wood (Bagassa guianensis Aubl) and green coconut mesocarp (cocos nucifera) residues as textile dye removers (Remazol Red and Remazol Brilliant Violet)

In this work the efficiency of two lignocellulosic waste materials, wood residues and coconut mesocarp, were investigated as adsorbents towards two representative textile dyes (Remazol Red, RR and Remazol Brilliant Violet, RBV). The moisture, carbohydrate, protein, lipid, ash and fiber contents of b...

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Bibliographic Details
Published in:Journal of environmental management 2017-12, Vol.204 (Pt 1), p.23-30
Main Authors: Monteiro, Mônica S., de Farias, Robson F., Chaves, José Alberto Pestana, Santana, Sirlane A., Silva, Hildo A.S., Bezerra, Cícero W.B.
Format: Article
Language:English
Subjects:
Adsorption
Agricultural waste
Cocos - chemistry
Coloring Agents - chemistry
Hydrogen-Ion Concentration
Kinetics
Textile dyes
Textiles
Wood
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Summary:In this work the efficiency of two lignocellulosic waste materials, wood residues and coconut mesocarp, were investigated as adsorbents towards two representative textile dyes (Remazol Red, RR and Remazol Brilliant Violet, RBV). The moisture, carbohydrate, protein, lipid, ash and fiber contents of both natural matrices were characterized. The materials were also characterized by infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, specific surface area analysis and thermogravimetry. The adsorption of dyes was monitored by using UV–Vis spectrophotometry. It was verified that both, coconut mesocarp (CM) and wood residues can act as effective adsorbents towards the investigated dyes. It is verified that the maximum adsorption capacity ΓM (mg g−1) for RBV and RR are 7.28 and 3.97 towards CM and 0.64 and 0.71 towrads SD. Furthermore, it was verified that the adsorption is strongly pH dependent and, as a general behavior, an increase in the pH value is associated with a decrease of the total amount of adsorbed dye. The adsorption of violet dye onto coconut mesocarp is well described by the Langmuir model, while all the remazol red fitted better with the Freundlich equation. •Coconut mesocarp and wood sawdust showed good adsorption towards anionic dyes.•Remazol Red and Remazol Brilliant Violet adsorptions are favored in acidic medium.•The dyes adsorption is described by Langmuir and Freundlich equations.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2017.08.033